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Recent Question:
Inconsistent water temp with submersible heater
Recent Question:
Do I need to have water circulation for this heater to work?
Recent Question:
How long is the ht10 and ht30
Recent Question:
do the submersibl heater have to be placed at the bottom of the tank to work? also if the indicator light do not stay on , do this mean the heater is
Questions with Most Recent Answers
Question:
Inconsistent water temp with submersible heater
Question:
Do I need to have water circulation for this heater to work?
Question:
How long is the ht10 and ht30
Question:
do the submersibl heater have to be placed at the bottom of the tank to work? also if the indicator light do not stay on , do this mean the heater is

Customer Questions & Answers for
HT Submersible Aquarium Heaters

Tetra's HT line of heaters are easy-to-use and work in aquariums ranging from 2 to 55 gallons. The HT10 and HT30 have electronic thermostats that automatically adjust heat output to keep water at a constant 78 degrees F. The HT55 is adjustable between 72 degrees F and 85 degrees F. All HT heaters have indicator lights to let you know when the heater is on, heating the aquarium.
Customer Questions & Answers:
48 Questions
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67 Answers

Questions & Answers for Tetra HT Submersible Aquarium Heaters

Question

tetra submersible heater 2-15 gallons malfunction

my heater is malfunctioning. this is the second heater i have bought, the first one had to be replaced bc it wouldnt come on at all. now this second heater when i first plugged it in, the red light came on which indicates its working but seconds later it automatically goes off and the green light doenst come on. and my thermometer is not at the temp that this heater is suppose to make it be. anyway i unplug heater for a min and plug back in and then the red light comes on but seconds later it goes off and i've done this over and over.... its malfunctioning, why? i have a 10 gallon tank
How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 1 year, 10 months ago
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resa
louisiana
on HT Submersible Aquarium Heaters
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answer 1
Resa,
It sounds like your heater is trying to begin its heating cycle. Could there be anything in the line of the heater that would cause it to shut back off. Ie, a heating vent/floor register in close proximity of the heater? If not, please call our customer care line at 1-800-526-0650 so we can assist you in getting a warranty replacement out to you.

Tetra2
answered 1 year, 10 months ago
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BREX
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Question

why is my tank temp not getting to the desired temp?

i purchased the 200 watt heater for my 55 gallon tank. the info for this heater said it was good for tanks from 30-60 gallons. i have had the unit running for over 36 hours now & the temp is a constant 70 degrees. the heater has been set on its highest setting for over 16 hours now. i have 1 glass & 2 stick on thermometers & they all read around 70. shouldn't the light stay on until the unit reaches the desired temp? this heater is supposed to reach temps in the mid 80's. i just need it to be around 75-78.
How long have you owned an aquarium? 3+ years
Type of tank: Tropical
Size of tank: Larger than 50 gallons
asked 1 year, 9 months ago
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garfish
wisc
on HT Submersible Aquarium Heaters
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answer 1
It sounds like it may not be functioning, but that would depend on the answer to the question: what is your room temperature? A lot of folks keep their houses cooler these days to keep energy costs down. Heaters are calibrated at a temperature of 72 degrees, and we recommend 3 watts per gallon of water for most tanks, up to about 5 watts per gallon in some situations. So if your house is in the mid-60's for example, you may be needing a larger heater or a second heater to be able to reach the desired temperature.

If your house is around 70-72 then the heater is not working and should be returned to the store for an exchange.

BREX
answered 1 year, 9 months ago
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BREX
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Question

i just got my new HT10 heater, and the light switches every couple of minutes. Is this normal?

How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
asked 1 year, 7 months ago
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Gorham953
on HT Submersible Aquarium Heaters
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answer 1
While the heater is initially heating up an aquarium, the cycling of heat will occur every few minutes in order to stairstep the temperature up until the water reaches the preset 78 degree mark.

Tetra2
answered 1 year, 7 months ago
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BREX
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Question

How do i position my water heater?

I bought the tetra HT30 water heater - does the power cord get submerged as well?
How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
Size of tank: 21 to 50 gallons
asked 1 year, 6 months ago
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Pumbaa
on HT Submersible Aquarium Heaters
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answer 1
Yes, it can. The heater is fully submersible and can be horizontal or vertical. The top of the heater and the cord that attaches there, goes under the water.

BREX
answered 1 year, 5 months ago
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BREX
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Question

Tetra HT 10 submersible heater

I have a 12liter bowl so the heater does not stick properly to side, Can I lay it on the gravel horizontally?
How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 1 year, 5 months ago
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Kath
Canada
on HT Submersible Aquarium Heaters
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answer 1
In general, heaters only work properly when they are suspended, with water all around them. They can be vertical or horizontal but are not supposed to be touching anything. Could you suction cup it to the bottom of the bowl, without gravel around it? You want it suspended off the bottom. Hope that makes sense.

BREX
answered 1 year, 5 months ago
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BREX
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Question

Is it normal or the fuse is burned out? Should I return the product and get a another one?

Tetra Submersible 50-Watt Heater : I just bought this item 5/30/2013 at afternoon. I submerged the product in the fish tank (10 gallons) and placed it horizontally and plugged the cord into the outlet. After 5 to 10 mins of turning on, I noticed a ring of black spots going around the glass tube.

Is it normal or the fuse is burned out? Should I return the product and get a another one?
How long have you owned an aquarium? 3+ years
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 1 year, 5 months ago
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Willi
San Jose, Ca
on HT Submersible Aquarium Heaters
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answer 1
We are not sure what you mean by "ring of black spots". You would need to contact our support staff, and most likely send them a picture of what you are seeing for us to answer this question. 1-800-526-0650.

BREX
answered 1 year, 5 months ago
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BREX
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Question

Heater size?

I have a 1.5 gal WaterWonders aquarium from Wal-Mart. I thought I'd try a smaller heater and is didn't produced enough heat. When I was looking through the fish department at Wal-Mart I noticed your 25w heater. Would is be safe to use in my 1.5 gallon with my male betta?
How long have you owned an aquarium? 3+ years
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 1 year, 3 months ago
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BettaBelle983
MO
on HT Submersible Aquarium Heaters
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answer 1
Mo,
Unfortunately, a 25w is going to be too strong for a 1.5 gallon aquarium and you run the high risk of overheating your aquarium. For the size tank you have, you really should not need any heater exceeding 10 watts. Our sister company, Marineland makes a mini-heater which is perfect for tanks that are 1-3 gallons.

Please also note that Bettas do not have to have a heater. They are quite comfortable in water that is around the 70-72 degree fahrenheit setting.

Tetra2
answered 1 year, 3 months ago
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BREX
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Question

Can the HT-10 Submersible heater be completely in the water? I want to know if I can put it in all the way to the red knob.

It looks like it has little vents at the top about a centimeter below the red knob.
How long have you owned an aquarium? 1-3 years
Type of tank: Tropical
Size of tank: 11 to 20 gallons
asked 1 year, 3 months ago
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Comments2010
Stafford, VA, USA
on HT Submersible Aquarium Heaters
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answer 1
Yes, it is fully submersible, and can be vertical or horizontal.

BREX
answered 1 year, 3 months ago
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BREX
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Question

light stopped working/HT30

purchased @ installed, light worked for couple days then stopped, should i stop using? the temp seems to be holding.
How long have you owned an aquarium? 3+ years
Type of tank: Tropical
Size of tank: 11 to 20 gallons
asked 1 year, 3 months ago
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helptetra
tn.
on HT Submersible Aquarium Heaters
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answer 1
with all of our heaters, you may not be noticing the light during heat cycles. After the heater has pulled the temperature in the tank up to the desired temp, the light will only come on during heating cycles- whichs last only a few minutes. That is why you may just be missing the light during these short periods. If your thermometer is showing a steady temp in the tank, your heater is indeed working.

Tetra2
answered 1 year, 3 months ago
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BREX
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Question

Can this heater (HT10 - 50W submersible heater) be covered by aquarium rocks?

Hi, I just bought this heater and am in the process of installing it and was just wondering if it was safe to bury the heater under the aquarium rocks or if it had to be completely free from touching anything?
asked 1 year, 2 months ago
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Dipndotts77
on HT Submersible Aquarium Heaters
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answer 1
No, you cannot install it that way. It has to be completely free to heat properly.

BREX
answered 1 year, 2 months ago
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BREX
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Question

i purchased the ht30 light stays green all the time and the temperature is 70

How long have you owned an aquarium? 6-12 months
Type of tank: Tropical
Size of tank: 11 to 20 gallons
asked 1 year, 2 months ago
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fishperson
Illinois, USA
on HT Submersible Aquarium Heaters
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answer 1
In that case, it sounds like either the heater or the thermometer is not working properly and should be replaced.

BREX
answered 1 year, 2 months ago
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BREX
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Question

50 watt automatic heater

How safe is the 50 watt preset heater that sells in Walmart for a 2 gallon? I'm have the smallest size thank it can go in and I'm concerned it may be too much. I've seen multiple sites that advertise this size hater right up to 30 gallons. I'm looking to keep my tank around 78. Also does it automatically shut off when it teaches the temp. Please respond ASAP as its getting cold in my apartment (I like it cooler)
How long have you owned an aquarium? 6-12 months
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 1 year, 2 months ago
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Cowboy
Bc
on HT Submersible Aquarium Heaters
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answer 1
It should be fine. We use it here in desktop tanks of various employees. It does shut off automatically when it reaches the temperature. Only drawback is it is preset and cannot be adjusted. What this means to you is that since you like your home cooler, you may need to adjust it, but can't. Heaters are calibrated for an average room temperature of 72 degrees. If you prefer one that is adjustable to allow you to meet your room's temperature and fish's needs, I would recommend our other line, Marineland Visi Therm. It is fully adjustable. For your size tank, I would recommend the 25 watt since you have some concerns of overheating.

BREX
answered 1 year, 2 months ago
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BREX
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Question

HEATER PROBLEM!!!!! I have a tetra heater for 2-15 gallons. I think the electronic thermostats might not be working right anymore....

HEATER PROBLEM!!!!! I have a tetra heater for 2-15 gallons. I think the electronic thermostats might not be working right anymore because the water temp has be up to around 90 F last weekend and the red light to say the heater is working is still on. I have had it for 2-3 years. Is it broken? Can I fix it? What do I do???
How long have you owned an aquarium? 1-3 years
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 1 year, 2 months ago
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Jessssssssss
Canada
on HT Submersible Aquarium Heaters
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answer 1
Sounds like it is time to replace it, yes. You can try unplugging it for about half an hour, then plugging it in again and see if it "re-sets" but in most cases, you need a new heater. That particular one has a 2 year warranty. If you can verify it is within that time frame, please call technical support at 1-800-526-0650 for assistance.

BREX
answered 1 year, 2 months ago
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BREX
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Question

can the ht55 200w submersible heater go all the way in the water ?

How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
Size of tank: Larger than 50 gallons
asked 1 year, 2 months ago
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mcloven
Palatine, IL, USA
on HT Submersible Aquarium Heaters
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answer 1
Yes, it is fully submersible.

BREX
answered 1 year, 2 months ago
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BREX
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Question

our heater broke and our turtle was in the tank when it broke should we be worried?

How long have you owned an aquarium? 6-12 months
Type of tank: Reptile/Amphibian
Size of tank: 21 to 50 gallons
asked 1 year, 1 month ago
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jazmyn
Madison, WI, USA
on HT Submersible Aquarium Heaters
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answer 1
No, there should not be any reason to worry about the turtle. There is nothing toxic to the animal, in the heater.

BREX
answered 1 year, 1 month ago
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BREX
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Question

Can I use the HT10 50W heater in a 5 gallon arcrylic tank (Aqueon)?

How long have you owned an aquarium? 6-12 months
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 1 year ago
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Azoreblue
on HT Submersible Aquarium Heaters
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answer 1
The maximum number of watts per gallon you want for a heater is 5, so a 5 gallon tank would require a 25 watt heater. I would recommend the Marineland 25 Watt Visi Therm. We make it as well.

BREX
answered 1 year ago
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BREX
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Question

I just bought a new heater and it doesn't seem to be heating the water?

I have a 36 gallon tank and just purchased a new heater, but it doesn't seem to be heating the water, the light goes on for a few seconds and then goes off right away, what's wrong? shouldn't it stay lit until the water warms up?
How long have you owned an aquarium? 3+ years
Type of tank: Tropical
Size of tank: 21 to 50 gallons
asked 11 months ago
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wrapper1
Orange City, Iowa
on HT Submersible Aquarium Heaters
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answer 1
No, it will not stay on until it reaches the temperature of 76-78 degrees. It will go on/off, on/off, until it can reach it. This prevents over heating. Make sure the heater is at least 150-200 watts, for that size tank, and monitor the thermometer in your tank. Depending on tank size and starting temperature, it can take 2-24 hours to heat the tank up.

BREX
answered 11 months ago
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BREX
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Question

Is it ok if the heater has the black rubber top sticking out of the water or does the entire unit need to be under water?

How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 11 months ago
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Bond
Windham, NH
on HT Submersible Aquarium Heaters
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answer 1
As long as the glass part is fully submerged, that's fine.

BREX
answered 11 months ago
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BREX
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Question

my heater won't heat up my fish tank and it's a new heater (1 week old)

we have a 55 gal tank and we got a 200 wt heater that is only 1 wk old. it don't seem to work or doesn't seem to heat up the tank. our tank is only at 70 and we had to turn the heat up for the home. what can we do to get it to heat up the tank better? the heater is also up all the way. the light does go on and off.
How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
Size of tank: Larger than 50 gallons
asked 11 months ago
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Rochelle
on HT Submersible Aquarium Heaters
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answer 1
If the room temperature is higher than 70, i.e. 75, and your thermometer is still reading 70, you may have an issue with the thermometer and not the heater. We recommend checking with a second thermometer first.

If, however, room temperature is 68-70 degrees, and you are at 70, then the heater definitely is not working. In this case you would return it to the store and exchange it or call our support staff at 1-800-526-0650.

BREX
answered 11 months ago
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BREX
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Question

I have a Tetra 1 gallon Hexagon Tank and need a heater to keep water warm for a Beta - Suggestions?

How long have you owned an aquarium? Less than 6 months
Type of tank: Tropical
Size of tank: Less than 10 gallons
asked 11 months ago
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softballgirl11
Chandler, AZ, USA
on HT Submersible Aquarium Heaters
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answer 1
Honestly, I would recommend a 2-5 gallon tank for a betta, as they need about that much room to move around, and you could give him a companion and a heater more easily. If that is not an option, the only heater I could recommend would be the 10 Watt Mini Heater by Marineland, our other brand. This is still a bit more than a 1 gallon would require, but it would fit in the tank.

Brex
answered 11 months ago
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